JPH11208447A - Reservoir for hydraulic fluid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic fluid reservoir in which the capacity of a clutch liquid chamber is ensured large so that the hydraulic fluid in the clutch liquid chamber will never be insufficient. SOLUTION: A lower bulkhead 22b extending from the bottom of a lower body 21b to its joining surface M with the upper body 21a is welded by the surface M to an upper bulkhead 22a which is formed on the upper body 21a, is positioned as confronting the lower bulkhead 22b, and extending to the joining surface M, and thereby a bulkhead 22 is formed which partitions into a brake liquid chamber 23 and a clutch liquid chamber 24. This allows enlarging the capacity of the clutch liquid chamber 24 compared with a conventional arrangement, and insufficient hydraulic fluid in the clutch liquid chamber 24 can be precluded which is likely generated by violent change in the hydraulic fluid level in the clutch liquid chamber 24 at the time of clutching operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hydraulic fluid reservoir for supplying hydraulic fluid to a brake master cylinder and a clutch master cylinder for a vehicle.

[0002]

2. Description of the Related Art For example, Japanese Patent Application No. 9-214203 previously filed by the present applicant is known as this kind of prior art. FIG. 4 shows this conventional hydraulic fluid reservoir. Hereinafter, this will be described.

The hydraulic fluid reservoir R comprises a reservoir body 1 and a cap 14 having a seal member 13. The reservoir body 1 includes an upper body 1a and a lower body 1b, and includes a brake fluid chamber 3 communicating with a brake master cylinder (not shown) and a clutch fluid chamber 4 communicating with a clutch master cylinder (not shown). The brake fluid chamber 3 and the clutch fluid chamber 4 are partitioned by the partition 2.
The height of the partition 2 is the same as that of the lower main body 1b.

[0004]

The operation of the clutch requires a large flow rate of the working fluid. Therefore, when the operation of the clutch is performed, the level of the hydraulic fluid in the clutch fluid chamber fluctuates. In the conventional hydraulic fluid reservoir R shown in FIG. 4, when the fluid level of the hydraulic fluid is higher than the height of the partition 2, the amount of the hydraulic fluid used for the clutch operation is sufficiently ensured. Although there is no problem, for example, when the hydraulic fluid decreases and the fluid level decreases due to wear of the brake shoe, the amount of the hydraulic fluid secured in the clutch fluid chamber 4 is determined by the height of the partition 2. . The height of the partition wall 2 of the conventional reservoir main body 1 is up to the mating surface of the upper main body 1a and the lower main body 1b. It is conceivable that hydraulic fluid runs short in the interior. In addition, when a vehicle equipped with the conventional hydraulic fluid reservoir travels on a rough road, the vibration generated at that time causes the hydraulic fluid level to undulate in the hydraulic fluid reservoir, thereby causing the clutch fluid chamber 4 Hydraulic fluid flows into the brake fluid chamber 3 and the hydraulic fluid in the clutch fluid chamber 4 becomes insufficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a hydraulic fluid reservoir in which a large capacity of a clutch fluid chamber is ensured so that a shortage of hydraulic fluid does not occur in the clutch fluid chamber. .

[0006]

An object of the present invention is to form an internal space by welding an upper main body and a lower main body made of a synthetic resin material, and to interpose a partition formed in the internal space with a brake fluid chamber. In the hydraulic fluid reservoir partitioned into a clutch fluid chamber, the partition wall extends from a bottom of the lower main body and extends to a mating surface of the lower main body and the upper main body, and the lower partition wall formed in the upper main body. The working fluid reservoir is formed by welding an upper partition that is arranged at a position opposite to the upper surface and extends to the mating surface at the mating surface.

In the present invention, a lower partition is formed on the lower body, and an upper partition is formed on the upper body. And
A partition partitioning the brake fluid chamber and the clutch fluid chamber is formed by welding the upper partition and the lower partition at the mating surface. As a result, a larger capacity of the clutch fluid chamber can be secured than before, and it is possible to prevent a shortage of hydraulic fluid in the clutch fluid chamber.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show a working fluid reservoir R 'according to an embodiment of the present invention. The hydraulic fluid reservoir R ′ includes a reservoir main body 21 and a cap 31 having a seal member 30. The reservoir body 21 includes an upper body 21a and a lower body 21b made of a synthetic resin material. The upper main body 21a and the lower main body 21b are welded to form a space inside the reservoir main body 21, and this inner space is partitioned by a partition 22 into a brake fluid chamber 23 and a clutch fluid chamber 24. As shown in FIG. 2 and FIG.
Is defined such that its cross section is substantially trapezoidal.

Two communication ports 2 for communicating with two hydraulic chambers of a tandem-type brake master cylinder (not shown) are provided at the bottom of the reservoir body 21 corresponding to the brake fluid chamber 23.
5 and 26 are formed, and a clutch communication port 27 for communicating with a hydraulic chamber of a clutch master cylinder (not shown) is formed at a lower portion of the reservoir body 21 corresponding to the clutch liquid chamber 24. The brake fluid chamber 23 is further divided into two fluid chambers 23a and 23b by a boundary forming wall portion 28, and brake communication ports 25 and 26 are formed corresponding to these fluid chambers. As described above, the hydraulic fluid reservoir R ′ according to the present embodiment is configured to supply hydraulic fluid to three independent systems of a tandem type brake master cylinder and a clutch master cylinder (not shown), and these two master cylinders are used. The communication ports are arranged at positions different from the above, and each communication port is connected to the hydraulic chamber of each master cylinder via a communication pipe (not shown).

In the brake fluid chamber 23, a float 35 for detecting a fluid level, which is movable in accordance with the amount of hydraulic fluid, is disposed. The float 35 is vertically movable by being guided by an inner wall surface of a cylindrical guide wall 38 projecting upward from the bottom of the reservoir body 21. The guide wall 38 is formed so as to surround the side circumference of the float 35, and a guide piece 38a is formed on the inner wall surface thereof.
The guide groove formed on the side peripheral portion of No. 5 is fitted. A permanent magnet 39 is provided at the bottom of the float 35, and a reed switch 40 operated by the magnetic flux of the permanent magnet 39 is arranged at the bottom of the reservoir body 21. The float 35 descends due to a shortage of hydraulic fluid, and the reed switch 40
The circuit is configured such that a warning light (not shown) is turned on when the is activated. Further, a claw portion 41 is formed at an upper end portion of the guide wall 38 (see FIG. 2), and the upper main body 21a is formed.
When the lower body 21b is welded to the lower body 21b, the lower body 2
When 1b is a single body, the float 35 is prevented from falling off by the engagement between the claw portion 41 and the float 35.

The upper body 21a is provided with an inlet 29 for injecting a working fluid into the internal space.
Is provided with a cap 31 via a circular sealing member 30. Also, at the bottom of the injection port 29,
As shown in FIG. 1, a cylindrical partition wall 32 is integrally formed and extends toward the mating surface M, but does not reach the mating surface M, and a lower end portion of the partition wall 32 is formed. Is opposed to the mating surface M with a gap. This partition wall 32
A slit 33 is formed in the side wall surface of the brake fluid chamber 23 so that the working fluid injected from the injection port 29 can be smoothly poured into the brake fluid chamber 23. Further, a plate member 34 is attached to the bottom of the partition wall 32 (see FIG. 3), and the upper end of the float 35 is brought into contact with the lower surface of the plate member 34 to regulate the upper limit position of the float 35. I am trying to do it. Further, the injection chamber 3 is formed by the partition wall 32 and the plate-like member 34.
6, a filter (not shown) can be arranged in the injection chamber 36.

The partition 22 comprises an upper partition 22a and a lower partition 22.
b. The lower partition 22b is formed integrally with the lower main body 21b, extends from the bottom of the lower main body 21b, and extends to the mating surface M between the lower main body 21b and the upper main body 21a. The upper partition 22a is formed integrally with the cylindrical partition wall 32 of the upper main body 21a (see FIG. 3). The upper partition 22a is arranged at a position facing the lower partition 22b and extends to the mating surface M. I have. And the upper body 2
When welding 1a and lower main body 21b, upper partition 22a and lower partition 22b are also welded on mating surface M, and partition 22 is formed.

An opening 37 is formed in the upper partition wall 22a so as to communicate an injection chamber 36 into which the hydraulic fluid is injected and the clutch fluid chamber 24. The upper end of the opening 37 has a maximum hydraulic fluid storage fluid. It is located above the plane L. When the hydraulic fluid is injected, the clutch fluid chamber 2
4 is filled with a hydraulic fluid. The upper body 21a and the lower body 21b are each formed by a mold. At this time, when the upper body 21a is formed by a mold, the opening 37 is also formed.
For example, they are formed together by a slide pin or the like.

This embodiment is configured as described above, and the operation will be described next.

Upper partition 22 formed on upper body 21a
a and the lower partition wall 22b formed on the lower main body 21b are welded together at the mating surface M to form the partition wall 22, so that the partition wall 22 can be formed higher than before, and the hydraulic fluid on the brake fluid chamber 23 side can be formed. Clutch fluid chamber 24 independent of reduction
The line of the liquid level that guarantees the amount of the hydraulic fluid that can be stored therein can be set at a high position. As a result, the clutch fluid chamber 2
4 can secure a large amount of hydraulic fluid. Therefore, in the clutch operation in which the level of the hydraulic fluid fluctuates greatly, it is possible to prevent the hydraulic fluid from running short in the clutch fluid chamber 24.

As a method of increasing the height of the partition wall 22, an upper partition wall 22a is previously formed when a mold is formed on the upper main body 21a, and the upper main body 21a and the lower main body 21b are joined by a mating surface M. When welding, the upper partition 22a and the lower partition 2 formed on the lower main body 21b are formed.
The partition 22 is formed by welding 2b. In this manner, the formation of the partition walls 22 higher than in the related art can be easily performed. Further, since the capacity of the clutch fluid chamber 24 can be increased without changing the size of the hydraulic fluid reservoir, the installation space for the hydraulic fluid reservoir can be the same as the conventional case.

The working fluid injected from the inlet 29 is supplied to the clutch fluid chamber 24 through an opening 37 formed in the upper partition 22a. The opening 37 forms the upper body 21a in a mold. At the same time. Therefore, it is not necessary to open the opening 37 in the upper body 21a later, and this work is omitted.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these, and various modifications can be made based on the technical concept of the present invention.

For example, in the above-described embodiment, the partition wall 22 defines the clutch liquid chamber 24 so that its cross section is substantially trapezoidal. However, of course, other shapes such as a semicircular cross section are used. The partition wall 22 may be formed so as to define the clutch liquid chamber 24 so as to have a shape.

The opening 37 is formed together when forming the upper body 21a in a mold.
After forming the die 1a, it may be formed by mechanical processing.

[0022]

As described above, according to the hydraulic fluid reservoir of the present invention, the brake fluid is welded by joining the upper partition formed on the upper main body and the lower partition formed on the lower main body at the mating surface. A partition partitioning the chamber from the clutch liquid chamber is formed. As a result, the capacity of the clutch fluid chamber can be easily increased, and shortage of the hydraulic fluid in the clutch fluid chamber due to severe fluid level fluctuation of the hydraulic fluid due to the clutch operation can be prevented.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire hydraulic fluid reservoir according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line [2]-[2] in FIG.

FIG. 3 is a sectional view taken along line [3]-[3] in FIG.

FIG. 4 is a side sectional view showing the entirety of a conventional hydraulic fluid reservoir.

[Explanation of symbols]

 21 Reservoir Body 21a Upper Body 21b Lower Body 22 Partition Wall 22a Upper Partition 22b Lower Partition 23 Brake Fluid Chamber 24 Clutch Fluid Chamber 29 Inlet 37 Opening L Maximum Storage Liquid Level M Fitting Surface R 'Operating Fluid Reservoir

Claims (4)

[Claims] 1. An operating fluid formed by welding an upper body and a lower body made of a synthetic resin material to form an internal space, and separating a brake fluid chamber and a clutch fluid chamber with a partition formed in the internal space interposed therebetween. In the reservoir, the partition wall extends from a bottom of the lower body and extends to a mating surface of the lower body and the upper body,
A hydraulic fluid reservoir formed by welding an upper partition formed on the upper body and facing the lower partition and extending to the mating surface at the mating surface. 2. An upper body is provided with an inlet for injecting a working fluid into the inner space, and an opening communicating with the clutch liquid chamber is formed in the upper partition. The hydraulic fluid reservoir according to claim 1, wherein: 3. The hydraulic fluid reservoir according to claim 2, wherein an upper end of the opening is located at a position higher than a maximum storage level of the hydraulic fluid reservoir body. 4. The opening, wherein the upper body, the lower body,
The hydraulic fluid reservoir according to claim 2, wherein the upper partition and the lower partition are formed by a mold.